write interpreter details into bzt.log

[greyfenrir]

Each PR must conform to Developer's Guide.

Quick checklist:

• Description of PR explains the context of change
• Unit tests cover the change, no broken tests
• No static analysis warnings (Codacy etc.)
• Documentation update
• Changes file inside site/dat/docs/changes directory, one-line note of change inside

[codecov]

Codecov Report

Merging #1416 into master will increase coverage by 0.01%.
The diff coverage is 52.64%.

@@            Coverage Diff             @@
##           master    #1416      +/-   ##
==========================================
+ Coverage   92.97%   92.98%   +0.01%     
==========================================
  Files         117      117              
  Lines       29678    29682       +4     
==========================================
+ Hits        27591    27596       +5     
+ Misses       2087     2086       -1     

Impacted Files	Coverage Δ
bzt/utils.py	88.30% <ø> (+0.41%)	⬆️
bzt/cli.py	83.42% <42.86%> (-1.41%)	⬇️
bzt/modules/tsung.py	89.03% <66.67%> (+0.53%)	⬆️
bzt/engine/engine.py	90.70% <100.00%> (ø)

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